“sis 09 - integrated methods and models for assessing coastal vulnerability and adaptation to...
TRANSCRIPT
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“SIS 09 - Integrated Methods and Models for Assessing Coastal Vulnerability and Adaptation to
Climate Change in the Pacific Countries”
Presenter: Roshni Lata (Research Assistant)
Pacific Centre for Environment and Sustainable Development
University of the South Pacific
FIJI
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Introduction
3 Project site areas
Aitutaki, Cook Islands
Natadola, Viti Levu, FIJI
Navua, Viti Levu, FIJI
NDMO estimated a damage cost of $FJ850 million from the year 1982-2002 for Fiji due to disasters
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“Vulnerability of a Coastal Township to Flooding Associated with Extreme Rainfall Events In Fiji”
By: M. Mataki, K. Koshy, R. Lata and L. Ralogaivau
• Findings of this paper on vulnerability to flooding is through community survey (2003 and 2004), academic papers, rainfall data analysis and through the insight of the the recent flash flood
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Purpose
To characterise the vulnerability of the Navua community to flooding
To understand the non-climatic (human induced) factors that contribute to flooding
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Introduction
Viti Levu, Fiji Total land area of
10, 388 square km
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Introduction - Navua
Majority of the population reside around the “central business district”
The current population is estimated to be ~ 7000.
About 30% of the population within the project site has some form of paid employment (2003)
Navua Landuse
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Navua River
It is the fourth largest river in Viti Levu The rivers length running along the site is
about 5.81km It acts as the major reserve for water and
sediment runoff from the upper catchment Dredging was carried out in 1982 and 1992
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Flooding
Ration within the project site area incurred a bill of $112, 803
Damages to homes was estimated to be around $190, 000 within the site
Intensive damage to agriculture, infrastructure and human health
Source: Fiji Red Cross Society
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Flooding
Flooding was exacerbated by the clogged irrigation channels, dysfunctional flood gates and the accumulation of sediments in the Navua River
Human health suffering especially increase in water-borne diseases were observed
Source: Fiji Red Cross Society
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Factors contributing to vulnerability towards Flooding
Non-climatic– Socio-economic – Logging operation, aggregate mining and
haphazard farming practices – Political Indifference
Climatic– Prolonged and intense rainfall can increase the
potential of flooding
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Data Source and Analysis
Data obtained is from FMS– Climatological rainfall normal (1961-1990)– Period (1960 –2003)– daily rainfall data – Single FMS station (Tamanoa)
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Results and Data Analysis
The total climatological annual rainfall normal of Navua is 3500mm.
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Results and Data Analysis
April has the most incidences of rainfall greater than or equal to 100mm, followed by March.
The least incidences of rainfall (>100mm) being in the months, June, July and August
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Results and Data Analysis
April and March daily rainfall
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Results and Data Analysis
The return-period of the intense daily rainfall events has reduced from ~5 years to ~3 years
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Conclusion
No increase trends of rainfall in the past 4 decades apart from inter-annual variability in rainfall as a result of El nino and La Nina events respectively.
A reduction in the return period of intense rainfall events in months March and April from ~5 years to ~3 years in the recent decade
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Conclusion
Several factors have compounded to an increase in the vulnerability of the Navua community to flooding
The government needs to intervene through appropriate policies and actions to reduce the impact of flooding on the livelihood of the Navua community
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Navua Project Site
Source: Fiji Red Cross Society